1. The First Clinical College, Hubei University of Chinese Medicine, Wuhan, Hubei 430065, P.R. China
2. Department of Orthopaedics, General Hospital of Central Theater Command of PLA, Wuhan, Hubei 430070, P.R. China
3. The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China